More challenges of screening for cancer (1)

From
Nick Hardwick, Stafford, UK

H. Gilbert Welch makes a very good point about the danger that screening will find cancers that aren’t going to do us any harm (7 April, p 44). However, as a doctor who has investigated many people for cancer, and who has been investigated for cancer myself, I think the real challenge for medicine is to determine which tumours will progress dangerously, and which will not.